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The hair on mammals’ bodies helps them to keep warm. In cold weather, the hairs stand up to trap a layer of warm air next to the skin. Musk oxen of the Arctic have the longest hair of any mammal, except for humans. Mammals that live in cold water, such as seals and All mammals groom or clean their fur to keep it in good condition. Macaque monkeys help one another by removing ticks and fleas. 8

whales, have an extra layer of fat, called blubber, under their skin. This keeps them warm even though they have close to no hair.

Manatees are water-dwelling mammals, like seals, whales, and dolphins. They swim along by beating their powerful tails up and down. 8

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